Answers

Subtract 25/84 from 4/21

4/21 - 25/84 is -3/28.

Steps for subtracting fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 21 and 84 is 84
   
   Next, find the equivalent fraction of both fractional numbers with denominator 84
2. For the 1st fraction, since 21 × 4 = 84,
   4/21 = 4 × 4/21 × 4 = 16/84
3. Likewise, for the 2nd fraction, since 84 × 1 = 84,
   25/84 = 25 × 1/84 × 1 = 25/84
4. Subtract the two like fractions:
   16/84 - 25/84 = 16 - 25/84 = -9/84
5. After reducing the fraction, the answer is -3/28

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